21201010120221 has 4 divisors (see below), whose sum is σ = 28268013493632. Its totient is φ = 14134006746812.

The previous prime is 21201010120201. The next prime is 21201010120313. The reversal of 21201010120221 is 12202101010212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21201010120221 - 2³⁷ = 21063571166749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201010120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533501686701 + ... + 3533501686706.

It is an arithmetic number, because the mean of its divisors is an integer number (7067003373408).

Almost surely, 2^{21201010120221} is an apocalyptic number.

It is an amenable number.

21201010120221 is a deficient number, since it is larger than the sum of its proper divisors (7067003373411).

21201010120221 is an equidigital number, since it uses as much as digits as its factorization.

21201010120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067003373410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201010120221 its reverse (12202101010212), we get a palindrome (33403111130433).

The spelling of 21201010120221 in words is "twenty-one trillion, two hundred one billion, ten million, one hundred twenty thousand, two hundred twenty-one".